Question about 2004 Yamaha YZ 250 F

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1980 Yamaha xs 400. First start of the spring. Had it started (will only start with kick starter not electric start) - but couldn't keep rpms high enough so it stalled. Went to kick start again and kick start locked up - what do I do!? Is the engine completely seized?

Posted by Anonymous on

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Sounds like it either dropped a valve, or broke a Connecting Rod. It is never good to get the RPM's too high on the first start. If you have to get them up high to keep it running, you probably have build up in the carb. Make sure it is in Neutral, and the first thing I would do is check the valves. Lift the valve cover off and see if any of them are missing. If not, unscrew the side cover on the left side of the bike(1 inch round cover using a flat tip screw dirver) and the nut in there that is exposed, try to turn it with a ratchet. If you cannot, pull the spark plug and using a pick up magnet, run it down the hole, swish it around a little, pull it out and see if you picked up anything. Last thing I can think of is drain your oil, and see if any metal comes out there, if not, your going to probably be rebuilding. It's not as expensive as it sounds if you do most of the work yourself and pay close attention to your service manual. If you need one, I can send you a digital copy for $30, or a grease proof binder and CD for $100.

Good luck.

Posted on Sep 09, 2010

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